Traffic bearing structure with permeable pavement

Abstract

A traffic bearing structure with a permeable pavement includes a subgrade, a base positioned on top of the subgrade, and a wear surface positioned on top of the base. The base includes aggregate compacted in a single lift, where the aggregate in the base includes different sized particles mixed together. The wear surface includes a permeable pavement. The particle size distribution of the aggregate in the base is selected to provide adequate stability and permeability for the permeable pavement.

1. A method for installing a traffic bearing structure comprising:
 (a) preparing a subgrade; 
 (b) installing a loose aggregate over the subgrade, where 90 to 100% of the aggregate passes through a 25 millimeter screen, 60 to 90% of the aggregate passes through a 12.5 millimeter screen, 30 to 70% of the aggregate passes through a 4.75 millimeter screen, and 7 to 40% of the aggregate passes through a 1.18 millimeter screen; 
 (c) compacting the aggregate into a single lift; and 
 (d) covering the aggregate with a permeable pavement such that the permeable pavement directly contacts the aggregate. 
 
     
     
       2. The method of  claim 1  where the permeable pavement is selected from the group consisting of block pavers, porous asphalt, porous concrete, and turf pavers. 
     
     
       3. The method of  claim 2  where the permeable pavement is porous asphalt. 
     
     
       4. The method of  claim 2  where the permeable pavement is block pavers. 
     
     
       5. The method of  claim 1  where the aggregate in the single lift has a permeability of at least 30,000 millimeters per day as measured by the ASTM D 2434 test method and a California Bearing Ratio (CBR) stability of at least 40 as measured by ASTM D 1883 (07). 
     
     
       6. The method of  claim 1  where the aggregate in the single lift has a permeability of at least 8,500 millimeters per day as measured by the ASTM D 2434 (06) test method and a California Bearing Ratio (CBR) stability of at least 25 as measured by the ASTM D 1883 (07) test method. 
     
     
       7. The method of  claim 1  where the aggregate has at least 25% void space after step (c). 
     
     
       8. The method of  claim 1  where the aggregate has at least 30% void space after step (c). 
     
     
       9. A traffic bearing structure comprising:
 a subgrade; 
 a base including a single lift positioned on top of the subgrade, where the lift includes an aggregate, where 90 to 100% of the aggregate passes through a 25 millimeter screen, 60 to 90% of the aggregate passes through a 12.5 millimeter screen, 30 to 70% of the aggregate passes through a 4.75 millimeter screen, and 7 to 40% of the aggregate passes through a 1.18 millimeter screen; and 
 a wear surface positioned on top of the lift, where the wear surface includes a permeable pavement selected from the group consisting of block pavers, porous asphalt, and porous concrete. 
 
     
     
       10. The traffic bearing structure of  claim 9  where the lift has a permeability of at least 8,500 millimeters per day as measured by the ASTM D 2434 (06) test and a California Bearing Ratio stability of at least 25 as measured by the ASTM D 1883 (07) test. 
     
     
       11. The traffic bearing structure of  claim 9  where the permeable pavement is block pavers. 
     
     
       12. The traffic bearing structure of  claim 9  where the permeable pavement is porous asphalt. 
     
     
       13. The traffic bearing structure of  claim 9  where the permeable pavement is porous concrete. 
     
     
       14. The traffic bearing structure of  claim 9  further comprising at least one drain line positioned within the base. 
     
     
       15. The traffic bearing structure of  claim 9  where the aggregate is compacted to between 90 and 95% as measured by the ASTM D 698 (07) test. 
     
     
       16. The traffic bearing structure of  claim 9  where the lift has one single compaction gradient.